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A full-size PP cotton cartridge lasts roughly 3 to 6 months, closer to 3 in hard water. A small universal cotton plug often needs changing every 4 to 8 weeks. Judge by colour, flow and smell, not the calendar. Weak flow is not always the filter. Check before you replace.

Most sourcing guides tell you how to find a shower head supplier. Far fewer tell you what actually happens after you send the first message, which is where deals stall. This article covers the practical numbers and steps: minimum order quantities, lead times, what OEM and ODM really mean in a shower factory, and where quality is checked. The figures below are our own, so you can benchmark other quotes against them.